# Microcat Torso Controller

## Description

Microcat Rev 8 single custom torso controller for Jetson Orin Nano 8GB, 15 Dynamixel TTL motors, torso IMU/control, audio and purchased ESP32\-S3 head interface\. Partial low\-power engineering capture only: high\-current protection, firmware, mechanical fit and fabrication remain blocked or incomplete\.

## Project Details

- **Owner:** summerexe
- **Created:** 10/19/2026
- **Last Updated:** 10/19/2026
- **Visibility:** Public
- **Copies:** 3

## Key Components

### J1 — [X6521FV\-2x20\-C85D32](https://flux.ai/lcsc/x6521fv-2x20-c85d32~a7ui.md)

- Manufacturer Part Number: X6521FV\-2x20\-C85D32
- Role: Isolation
- Package or Case Code: HDR\-TH\_40P\-P2\.54\-V\-F\-R2\-C20\-S2\.54
- Functional Group: IO J1 Jetson Host
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/C2883993\.pdf
- LCSC Part Number: C2883993
- Part Type: Female Headers
- Role Details: X6521FV\-2x20\-C85D32 logical J12 pin correspondence; pins2/4 5V NC; mating orientation UNVERIFIED
- Manufacturer Name: XKB Connection\(中国星坤\)

**Pins:**
- 1 [pin 1]
- 10 [pin 10]
- 11 [pin 11]
- 12 [pin 12]
- 13 [pin 13]
- 14 [pin 14]
- 15 [pin 15]
- 16 [pin 16]
- 17 [pin 17]
- 18 [pin 18]
- 19 [pin 19]
- 2 [pin 2]
- 20 [pin 20]
- 21 [pin 21]
- 22 [pin 22]
- 23 [pin 23]
- 24 [pin 24]
- 25 [pin 25]
- 26 [pin 26]
- 27 [pin 27]
- 28 [pin 28]
- 29 [pin 29]
- 3 [pin 3]
- 30 [pin 30]
- 31 [pin 31]
- 32 [pin 32]
- 33 [pin 33]
- 34 [pin 34]
- 35 [pin 35]
- 36 [pin 36]
- 37 [pin 37]
- 38 [pin 38]
- 39 [pin 39]
- 4 [pin 4]
- 40 [pin 40]
- 5 [pin 5]
- 6 [pin 6]
- 7 [pin 7]
- 8 [pin 8]
- 9 [pin 9]

### J2 — [B4B\-PH\-K\-S\(LF\)\(SN\)](https://flux.ai/lcsc/b4b-ph-k-slfsn~0ffw.md)

- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/2304140030\_JST\-B4B\-PH\-K\-S\-LF\-SN\_C131334\.pdf
- Role Details: CUSTOM NOT Qwiic:1 AUX\_5V\_FACE 2 GND 3 FACE\_SDA 4 FACE\_SCL; do not fabricate until head power sense/isolation harness resolved
- Connector Rows: 1
- Role: J\_FACE\_HOST
- Package or Case Code: CONN\-TH\_B4B\-PH\-K\-S
- Functional Group: IO J2 Face Host
- Part Type: Wire To Board / Wire To Wire Connector
- Symbol Style: parametric\-v1
- Connector Positions: 4
- Connector Type: Board to Wire
- Manufacturer Part Number: B4B\-PH\-K\-S\(LF\)\(SN\)
- Manufacturer Name: JST
- Product Info Url: https://lcsc\.com/product\-detail/PH\-Connectors\_JST\_B4B\-PH\-K\-S\-LF\-SN\_B4B\-PH\-K\-S\-LF\-SN\_C131334\.html
- JLCPCB Part Class: Extended Part
- LCSC Part Number: C131334
- Connector Pitch: 2mm
- Connector Gender: Female

**Pins:**
- 1 [pin 1]
- 2 [pin 2]
- 3 [pin 3]
- 4 [pin 4]

### J3 — [TSW\-106\-06\-T\-S](https://flux.ai/adrian95/tsw-106-06-t-s.md)

- Part Type: Connectors
- License: https://creativecommons\.org/licenses/by/4\.0/
- Role: SWD Debug
- Functional Group: IO J3 SWD Debug
- Mount: PCB
- Role Details: 1 VTREF3V3 2 GND 3 SWDIO 4 SWCLK 5 NRST 6 SWO; VTREF sense only never supply board
- Datasheet URL: http://suddendocs\.samtec\.com/prints/tsw\-xxx\-xx\-xxx\-x\-xx\-xxx\-mkt\.pdf
- Manufacturer Name: Samtec
- Manufacturer Part Number: TSW\-106\-06\-T\-S

**Pins:**
- 1 [pin 1]
- 2 [pin 2]
- 3 [pin 3]
- 4 [pin 4]
- 5 [pin 5]
- 6 [pin 6]

### J4 — [TSW\-106\-06\-T\-S](https://flux.ai/adrian95/tsw-106-06-t-s.md)

- Role Details: BENCH ONLY NOT BATTERY:1 TORSO3V3,2 GND,3 AUDIO5V,4 FACE5V,5 NC,6 NC\. Pins5/6 obsolete motor\-logic/permit disconnected for U2D2 migration\. NO motor supply/return through J4\. No high\-current protection or hardware motor\-power disconnect captured\.
- Part Type: Connectors
- License: https://creativecommons\.org/licenses/by/4\.0/
- Mount: PCB
- Datasheet URL: http://suddendocs\.samtec\.com/prints/tsw\-xxx\-xx\-xxx\-x\-xx\-xxx\-mkt\.pdf
- Role: Bench supply boundary
- Manufacturer Name: Samtec
- Functional Group: IO J4 Bench Boundary
- Manufacturer Part Number: TSW\-106\-06\-T\-S

**Pins:**
- 1 [pin 1]
- 2 [pin 2]
- 3 [pin 3]
- 4 [pin 4]
- 5 [pin 5]
- 6 [pin 6]

### J5 — [B2B\-PH\-K\-S\(LF\)\(SN\)](https://flux.ai/jecstronic/b2b-ph-k-slfsn~nss.md)

- Role Details: 1 SPK\_P 2 SPK\_N floating BTL; impedance/watts TBD; never AUX/GND
- Manufacturer Part Number: B2B\-PH\-K\-S\(LF\)\(SN\)
- Manufacturer Name: JST Sales America
- Symbol Style: parametric\-v1
- Functional Group: IO J5 BTL Speaker
- Part Type: Connector
- Datasheet URL: https://datasheet\.lcsc\.com/lcsc/1811151524\_JST\-Sales\-America\-B2B\-PH\-K\-S\-LF\-SN\_C131337\.pdf
- License: https://creativecommons\.org/licenses/by/4\.0/
- Role: Amplification

**Pins:**
- PIN1 [pin 1]
- PIN2 [pin 2]

### J6 — [B3B\-PH\-K\-S\(LF\)\(SN\)](https://flux.ai/adrian95/b3b-ph-k-slfsn~xzb.md)

- License: https://creativecommons\.org/licenses/by/4\.0/
- Role: Communication service tap
- Datasheet URL: https://www\.jst\-mfg\.com/product/pdf/eng/ePH\.pdf
- Role Details: CUSTOM JST PH 2mm service tap ONLY:1 GND,2 NC NO CONTACT/WIRE,3 TTL\_DATA to TP5\. NOT directly compatible with ROBOTIS EH2\.5mm\. External purchased U2D2 902\-0132\-000 \-\> passive EH harness \-\>XL330 bus; optional PH diagnostic spur\. Motor5V/return injection external, NEVER through J6/J4\. No MCU bus driver remains\. USB disconnect before motor power off; powered\-off DATA backpower not guaranteed\.
- Manufacturer Name: JST Sales America Inc\.
- Functional Group: IO J6 TTL Service
- Part Type: Connector
- Manufacturer Part Number: B3B\-PH\-K\-S\(LF\)\(SN\)

**Pins:**
- Pin\_1 [pin 1]
- Pin\_2 [pin 2]
- Pin\_3 [pin 3]

### J8 — [22284020](https://flux.ai/lcsc/22284020~toxy.md)

- Role Details: AMP ARM shunt absent default; bridges AUDIO5V toSD\_MODE for left channel; firmware mute control not captured
- Manufacturer Name: MOLEX
- Product Info Url: https://lcsc\.com/product\-detail/Others\_MOLEX\_22\-28\-4020\_MOLEX\-22\-28\-4020\_C234182\.html
- JLCPCB Part Class: Extended Part
- Package or Case Code: HDR\-TH\_2P\-P2\.54\-V\-M\-1
- Role: Protection
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/2408121843\_MOLEX\-22284020\_C234182\.pdf
- LCSC Part Number: C234182
- Functional Group: AUDIO U3 Speaker Amplifier
- Manufacturer Part Number: 22284020
- Part Type: Pin Headers

**Pins:**
- 1 [pin 1]
- 2 [pin 2]

### MK1 — [DMM\-4026\-B\-I2S\-R](https://flux.ai/adrian95/dmm-4026-b-i2s-r~0zv.md)

- Functional Group: AUDIO MK1 Backup Microphone
- Manufacturer Name: PUI Audio, Inc\.
- License: https://creativecommons\.org/licenses/by/4\.0/
- Datasheet URL: https://www\.mouser\.com/datasheet/2/334/DMM\_4026\_B\_I2S\_R\-1761385\.pdf
- Part Type: Microphone
- Role Details: DMM\-4026\-B\-I2S\-R candidate; USB\_ONLY DNP; MIC\_BACKUP\_POPULATED fitted after footprint acoustic audit; recording not validated
- Manufacturer Part Number: DMM\-4026\-B\-I2S\-R
- Role: Optional Backup Microphone

**Pins:**
- CONFIG [pin 2]
- GND [pin 4]
- LR [pin 1]
- SCK [pin 6]
- SD [pin 7]
- VDD [pin 3]
- WS [pin 5]

### TP1 — [S1751\-46](https://flux.ai/vasy_skral/s1751-46~eem.md)

- Part Type: Connectors
- Mount: Surface Mount
- Functional Group: MCU U1 Torso Controller
- Datasheet URL: https://content\.harwin\.com/m/386120eba96d2840/original/DRG\-02200\-Technical\-Drawing\-Datasheet\-S1751\-pdf\.pdf
- Role Details: S1751\-46 test loop; assign TORSO3V3 GND IMU\_INT1 IMU\_SCK TTL\_DATA MIC\_SD; exact loop footprint audit before fabrication
- Role: Sensing \(Shunt\)
- Manufacturer Name: Harwin
- Manufacturer Part Number: S1751\-46

**Pins:**
- \~ [pin 1]

### TP2 — [S1751\-46](https://flux.ai/vasy_skral/s1751-46~eem.md)

- Part Type: Connectors
- Mount: Surface Mount
- Role: Sensing \(Shunt\)
- Datasheet URL: https://content\.harwin\.com/m/386120eba96d2840/original/DRG\-02200\-Technical\-Drawing\-Datasheet\-S1751\-pdf\.pdf
- Role Details: S1751\-46 test loop; assign TORSO3V3 GND IMU\_INT1 IMU\_SCK TTL\_DATA MIC\_SD; exact loop footprint audit before fabrication
- Functional Group: MCU U1 Torso Controller
- Manufacturer Name: Harwin
- Manufacturer Part Number: S1751\-46

**Pins:**
- \~ [pin 1]

### TP3 — [S1751\-46](https://flux.ai/vasy_skral/s1751-46~eem.md)

- Part Type: Connectors
- Mount: Surface Mount
- Role: Sensing \(Shunt\)
- Datasheet URL: https://content\.harwin\.com/m/386120eba96d2840/original/DRG\-02200\-Technical\-Drawing\-Datasheet\-S1751\-pdf\.pdf
- Role Details: S1751\-46 test loop; assign TORSO3V3 GND IMU\_INT1 IMU\_SCK TTL\_DATA MIC\_SD; exact loop footprint audit before fabrication
- Manufacturer Name: Harwin
- Functional Group: MCU U1 Torso Controller
- Manufacturer Part Number: S1751\-46

**Pins:**
- \~ [pin 1]

### TP4 — [S1751\-46](https://flux.ai/vasy_skral/s1751-46~eem.md)

- Part Type: Connectors
- Mount: Surface Mount
- Role Details: S1751\-46 test loop; assign TORSO3V3 GND IMU\_INT1 IMU\_SCK TTL\_DATA MIC\_SD; exact loop footprint audit before fabrication
- Datasheet URL: https://content\.harwin\.com/m/386120eba96d2840/original/DRG\-02200\-Technical\-Drawing\-Datasheet\-S1751\-pdf\.pdf
- Manufacturer Name: Harwin
- Functional Group: MCU U1 Torso Controller
- Manufacturer Part Number: S1751\-46
- Role: Sensing \(Shunt\)

**Pins:**
- \~ [pin 1]

### TP5 — [S1751\-46](https://flux.ai/vasy_skral/s1751-46~eem.md)

- Part Type: Connectors
- Mount: Surface Mount
- Role: Sensing \(Shunt\)
- Functional Group: MCU U1 Torso Controller
- Datasheet URL: https://content\.harwin\.com/m/386120eba96d2840/original/DRG\-02200\-Technical\-Drawing\-Datasheet\-S1751\-pdf\.pdf
- Role Details: Passive TTL\_DATA test loop connected ONLY to custom PH J6 pin3; no MCU driver/bias\. Optional external U2D2 bus diagnostic tap; not power injection\. Exact loop footprint audit remains before fabrication\.
- Manufacturer Name: Harwin
- Manufacturer Part Number: S1751\-46

**Pins:**
- \~ [pin 1]

### TP6 — [S1751\-46](https://flux.ai/vasy_skral/s1751-46~eem.md)

- Role Details: S1751\-46 test loop; assign TORSO3V3 GND IMU\_INT1 IMU\_SCK TTL\_DATA MIC\_SD; exact loop footprint audit before fabrication
- Part Type: Connectors
- Mount: Surface Mount
- Datasheet URL: https://content\.harwin\.com/m/386120eba96d2840/original/DRG\-02200\-Technical\-Drawing\-Datasheet\-S1751\-pdf\.pdf
- Functional Group: MCU U1 Torso Controller
- Role: Sensing \(Shunt\)
- Manufacturer Name: Harwin
- Manufacturer Part Number: S1751\-46

**Pins:**
- \~ [pin 1]

### U1 — [STM32F411RET6](https://flux.ai/adrian95/stm32f411ret6~fh7.md)

- Part Type: Microcontroller
- Role: Torso Controller
- Datasheet URL: https://www\.st\.com/content/ccc/resource/technical/document/datasheet/b3/a5/46/3b/b4/e5/4c/85/DM00115249\.pdf/files/DM00115249\.pdf/jcr:content/translations/en\.DM00115249\.pdf
- Manufacturer Part Number: STM32F411RET6
- Role Details: STM32F411RET6 Cortex\-M4F 512KB flash 128KB SRAM; firmware pending; internal HSI first bring\-up
- Manufacturer Name: STMicroelectronics
- Functional Group: MCU U1 Torso Controller
- License: https://creativecommons\.org/licenses/by/4\.0/

**Pins:**
- BOOT0 [pin 60]
- NRST [pin 7]
- PA0 [pin 14]
- PA1 [pin 15]
- PA10 [pin 43]
- PA11 [pin 44]
- PA12 [pin 45]
- PA13 [pin 46]
- PA14 [pin 49]
- PA15 [pin 50]
- PA2 [pin 16]
- PA3 [pin 17]
- PA4 [pin 20]
- PA5 [pin 21]
- PA6 [pin 22]
- PA7 [pin 23]
- PA8 [pin 41]
- PA9 [pin 42]
- PB0 [pin 26]
- PB1 [pin 27]
- PB10 [pin 29]
- PB12 [pin 33]
- PB13 [pin 34]
- PB14 [pin 35]
- PB15 [pin 36]
- PB2 [pin 28]
- PB3 [pin 55]
- PB4 [pin 56]
- PB5 [pin 57]
- PB6 [pin 58]
- PB7 [pin 59]
- PB8 [pin 61]
- PB9 [pin 62]
- PC0 [pin 8]
- PC1 [pin 9]
- PC10 [pin 51]
- PC11 [pin 52]
- PC12 [pin 53]
- PC13 [pin 2]
- PC14\-OSC32\_IN [pin 3]
- PC15\-OSC32\_OUT [pin 4]
- PC2 [pin 10]
- PC3 [pin 11]
- PC4 [pin 24]
- PC5 [pin 25]
- PC6 [pin 37]
- PC7 [pin 38]
- PC8 [pin 39]
- PC9 [pin 40]
- PD2 [pin 54]
- PH0\-OSC\_IN [pin 5]
- PH1\-OSC\_OUT [pin 6]
- VBAT [pin 1]
- VCAP\_1 [pin 30]
- VDD\_1 [pin 19]
- VDD\_2 [pin 32]
- VDD\_3 [pin 48]
- VDD\_4 [pin 64]
- VDDA/VREF\+ [pin 13]
- VSS\_1 [pin 18]
- VSS\_2 [pin 31]
- VSS\_3 [pin 47]
- VSS\_4 [pin 63]
- VSSA/VREF\- [pin 12]

### U10 — [SN74LVC1G125DBVT](https://flux.ai/silicon-yard/sn74lvc1g125dbvt~lw.md)

- Functional Group: IO J1 Jetson Host
- Part Type: Integrated Circuit
- Role Details: SN74LVC1G125DBVT input5\.5V tolerant Ioff; powered destination domain
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/user\-uploaded/594bbdb66548d2db6a5adbf89a38a01d297a812a43293845d9a6d5e08586d90f\.pdf
- Manufacturer Name: Texas Instruments
- License: https://creativecommons\.org/licenses/by/4\.0/
- Role: Isolation
- Symbol Style: parametric\-v1
- Manufacturer Part Number: SN74LVC1G125DBVT

**Pins:**
- \~OE [pin 1]
- A [pin 2]
- GND [pin 3]
- VCC [pin 5]
- Y [pin 4]

### U11 — [SN74LVC1G125DBVT](https://flux.ai/silicon-yard/sn74lvc1g125dbvt~lw.md)

- Part Type: Integrated Circuit
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/user\-uploaded/594bbdb66548d2db6a5adbf89a38a01d297a812a43293845d9a6d5e08586d90f\.pdf
- Manufacturer Name: Texas Instruments
- Role Details: SN74LVC1G125DBVT input5\.5V tolerant Ioff; powered destination domain
- Functional Group: IO J1 Jetson Host
- License: https://creativecommons\.org/licenses/by/4\.0/
- Role: Isolation
- Symbol Style: parametric\-v1
- Manufacturer Part Number: SN74LVC1G125DBVT

**Pins:**
- \~OE [pin 1]
- A [pin 2]
- GND [pin 3]
- VCC [pin 5]
- Y [pin 4]

### U12 — [SN74LVC1G125DBVT](https://flux.ai/silicon-yard/sn74lvc1g125dbvt~lw.md)

- Part Type: Integrated Circuit
- Role: Isolation
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/user\-uploaded/594bbdb66548d2db6a5adbf89a38a01d297a812a43293845d9a6d5e08586d90f\.pdf
- Manufacturer Name: Texas Instruments
- License: https://creativecommons\.org/licenses/by/4\.0/
- Role Details: SN74LVC1G125DBVT input5\.5V tolerant Ioff; powered destination domain
- Functional Group: IO J1 Jetson Host
- Symbol Style: parametric\-v1
- Manufacturer Part Number: SN74LVC1G125DBVT

**Pins:**
- \~OE [pin 1]
- A [pin 2]
- GND [pin 3]
- VCC [pin 5]
- Y [pin 4]

### U13 — [SN74LVC1G125DBVT](https://flux.ai/silicon-yard/sn74lvc1g125dbvt~lw.md)

- Part Type: Integrated Circuit
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/user\-uploaded/594bbdb66548d2db6a5adbf89a38a01d297a812a43293845d9a6d5e08586d90f\.pdf
- Manufacturer Name: Texas Instruments
- Functional Group: AUDIO MK1 Backup Microphone
- Role: Isolation
- Role Details: SN74LVC1G125DBVT powered Jetson3V3 isolates capture DIN if Jetson off; USB\_ONLY DNP
- License: https://creativecommons\.org/licenses/by/4\.0/
- Symbol Style: parametric\-v1
- Manufacturer Part Number: SN74LVC1G125DBVT

**Pins:**
- \~OE [pin 1]
- A [pin 2]
- GND [pin 3]
- VCC [pin 5]
- Y [pin 4]

### U14 — [SN74AHCT1G125DBVR](https://flux.ai/silicon-yard/sn74ahct1g125dbvr.md)

- Symbol Style: parametric\-v1
- Functional Group: AUDIO U3 Speaker Amplifier
- Package or Case Code: SOT\-23\-5
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/user\-uploaded/61006149da51e453ca23519199402c034402c5e76aab72a46fb45bdbde3e5932\.pdf
- Manufacturer Part Number: SN74AHCT1G125DBVR
- Part Type: Integrated Circuit
- Role: Logic\-level Shifting
- Role Details: BCLK destination\-powered AUDIO5V; input leakage max1uA at VCC0 per TI; output never externally driven
- Manufacturer Name: Texas Instruments

**Pins:**
- \~OE [pin 1]
- A [pin 2]
- GND [pin 3]
- VCC [pin 5]
- Y [pin 4]

### U15 — [SN74AHCT1G125DBVR](https://flux.ai/silicon-yard/sn74ahct1g125dbvr.md)

- Symbol Style: parametric\-v1
- Role: Logic\-level Shifting
- Role Details: LRCLK destination\-powered AUDIO5V; input leakage max1uA at VCC0 per TI; output never externally driven
- Package or Case Code: SOT\-23\-5
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/user\-uploaded/61006149da51e453ca23519199402c034402c5e76aab72a46fb45bdbde3e5932\.pdf
- Manufacturer Part Number: SN74AHCT1G125DBVR
- Functional Group: AUDIO U3 Speaker Amplifier
- Part Type: Integrated Circuit
- Manufacturer Name: Texas Instruments

**Pins:**
- \~OE [pin 1]
- A [pin 2]
- GND [pin 3]
- VCC [pin 5]
- Y [pin 4]

### U16 — [SN74AHCT1G125DBVR](https://flux.ai/silicon-yard/sn74ahct1g125dbvr.md)

- Symbol Style: parametric\-v1
- Role: Logic\-level Shifting
- Functional Group: AUDIO U3 Speaker Amplifier
- Package or Case Code: SOT\-23\-5
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/user\-uploaded/61006149da51e453ca23519199402c034402c5e76aab72a46fb45bdbde3e5932\.pdf
- Manufacturer Part Number: SN74AHCT1G125DBVR
- Part Type: Integrated Circuit
- Role Details: DIN destination\-powered AUDIO5V; input leakage max1uA at VCC0 per TI; output never externally driven
- Manufacturer Name: Texas Instruments

**Pins:**
- \~OE [pin 1]
- A [pin 2]
- GND [pin 3]
- VCC [pin 5]
- Y [pin 4]

### U17 — [SN74LVC1G125DBVT](https://flux.ai/silicon-yard/sn74lvc1g125dbvt~lw.md)

- Part Type: Integrated Circuit
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/user\-uploaded/594bbdb66548d2db6a5adbf89a38a01d297a812a43293845d9a6d5e08586d90f\.pdf
- Manufacturer Name: Texas Instruments
- Role Details: Source\-powered UART barrier; Ioff output supports destination pullup without raw GPIO injection
- License: https://creativecommons\.org/licenses/by/4\.0/
- Symbol Style: parametric\-v1
- Functional Group: IO J1 Jetson Host
- Manufacturer Part Number: SN74LVC1G125DBVT
- Role: Isolation

**Pins:**
- \~OE [pin 1]
- A [pin 2]
- GND [pin 3]
- VCC [pin 5]
- Y [pin 4]

### U18 — [SN74LVC1G125DBVT](https://flux.ai/silicon-yard/sn74lvc1g125dbvt~lw.md)

- Part Type: Integrated Circuit
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/user\-uploaded/594bbdb66548d2db6a5adbf89a38a01d297a812a43293845d9a6d5e08586d90f\.pdf
- Functional Group: IO J1 Jetson Host
- Manufacturer Name: Texas Instruments
- Role: Isolation
- License: https://creativecommons\.org/licenses/by/4\.0/
- Symbol Style: parametric\-v1
- Role Details: Source\-powered UART barrier; Ioff output supports destination pullup without raw GPIO injection
- Manufacturer Part Number: SN74LVC1G125DBVT

**Pins:**
- \~OE [pin 1]
- A [pin 2]
- GND [pin 3]
- VCC [pin 5]
- Y [pin 4]

### U2 — [LSM6DSV16XTR](https://flux.ai/jecstronic/lsm6dsv16xtr~99t.md)

- Manufacturer Part Number: LSM6DSV16XTR
- Part Type: Sensor
- Manufacturer Name: STMicroelectronics NV
- Sensor Type: IMU
- Datasheet URL: https://www\.st\.com/content/ccc/resource/technical/document/datasheet/group3/47/03/b2/44/47/32/4b/76/DM00741844/files/DM00741844\.pdf/jcr:content/translations/en\.DM00741844\.pdf
- Functional Group: SENSE U2 Torso IMU
- License: https://creativecommons\.org/licenses/by/4\.0/
- Role: Torso IMU
- Role Details: LSM6DSV16XTR mode1 4\-wire SPI; rigid torso mount axes pending CAD

**Pins:**
- CS [pin 12]
- GND [pin 6]
- GND [pin 7]
- INT1 [pin 4]
- INT2 [pin 9]
- OCS\_AUX [pin 10]
- SCL [pin 13]
- SCx/AH2/QVAR2 [pin 3]
- SDA [pin 14]
- SDO\_AUX [pin 11]
- SDO/SA0 [pin 1]
- SDx/AH1/QVAR1 [pin 2]
- VDD [pin 8]
- VDD\_IO [pin 5]

### U3 — [MAX98357AETE\+T](https://flux.ai/adrian95/max98357aeteplust~wk.md)

- Role: Speaker Amplifier
- License: https://creativecommons\.org/licenses/by/4\.0/
- Part Type: Integrated Circuit
- Datasheet URL: https://www\.analog\.com/media/en/technical\-documentation/data\-sheets/max98357a\-max98357b\.pdf
- Role Details: MAX98357AETE\+T BTL only; never connect outputs to GND or AUX; JetPack configuration pending
- Symbol Style: parametric\-v1
- Manufacturer Name: Analog Devices Inc\./Maxim Integrated
- Functional Group: AUDIO U3 Speaker Amplifier
- Manufacturer Part Number: MAX98357AETE\+T

**Pins:**
- \~SD\_MODE [pin 4]
- BCLK [pin 16]
- DIN [pin 1]
- GAIN\_SLOT [pin 2]
- GND\_1 [pin 3]
- GND\_2 [pin 11]
- GND\_3 [pin 15]
- LRCLK [pin 14]
- N\.C\.\_1 [pin 5]
- N\.C\.\_2 [pin 6]
- N\.C\.\_3 [pin 12]
- N\.C\.\_4 [pin 13]
- OUTN [pin 10]
- OUTP [pin 9]
- THERMAL\_PAD [pin 17]
- VDD\_1 [pin 7]
- VDD\_2 [pin 8]

### U4 — [TCA9517ADGKR](https://flux.ai/lcsc/tca9517adgkr~cktt.md)

- Package or Case Code: VSSOP\-8\_L3\.0\-W3\.0\-P0\.65\-LS5\.0\-BL
- Part Type: Translators / Level Shifters
- Manufacturer Part Number: TCA9517ADGKR
- Functional Group: IO J2 Face Host
- Role Details: TCA9517ADGKR A=Jetson B=head; VCCB must follow actual head 3V3; separate sense wire required before connection
- Role: Face I2C Isolation
- Manufacturer Name: TI\(德州仪器\)
- LCSC Part Number: C201698
- JLCPCB Part Class: Extended Part
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/1810181614\_Texas\-Instruments\-TCA9517ADGKR\_C201698\.pdf
- Product Info Url: https://lcsc\.com/product\-detail/\_TI\_TCA9517ADGKR\_TCA9517ADGKR\_C201698\.html

**Pins:**
- EN [pin 5]
- GND [pin 4]
- SCLA [pin 2]
- SCLB [pin 7]
- SDAA [pin 3]
- SDAB [pin 6]
- VCCA [pin 1]
- VCCB [pin 8]

### U8 — [SN74LVC1G125DBVT](https://flux.ai/silicon-yard/sn74lvc1g125dbvt~lw.md)

- Part Type: Integrated Circuit
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/user\-uploaded/594bbdb66548d2db6a5adbf89a38a01d297a812a43293845d9a6d5e08586d90f\.pdf
- Manufacturer Name: Texas Instruments
- Role Details: SN74LVC1G125DBVT input5\.5V tolerant Ioff; powered destination domain
- Role: Isolation
- License: https://creativecommons\.org/licenses/by/4\.0/
- Functional Group: IO J1 Jetson Host
- Symbol Style: parametric\-v1
- Manufacturer Part Number: SN74LVC1G125DBVT

**Pins:**
- \~OE [pin 1]
- A [pin 2]
- GND [pin 3]
- VCC [pin 5]
- Y [pin 4]

### U9 — [SN74LVC1G125DBVT](https://flux.ai/silicon-yard/sn74lvc1g125dbvt~lw.md)

- Part Type: Integrated Circuit
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/user\-uploaded/594bbdb66548d2db6a5adbf89a38a01d297a812a43293845d9a6d5e08586d90f\.pdf
- Manufacturer Name: Texas Instruments
- Functional Group: IO J1 Jetson Host
- License: https://creativecommons\.org/licenses/by/4\.0/
- Role Details: SN74LVC1G125DBVT input5\.5V tolerant Ioff; powered destination domain
- Symbol Style: parametric\-v1
- Role: Isolation
- Manufacturer Part Number: SN74LVC1G125DBVT

**Pins:**
- \~OE [pin 1]
- A [pin 2]
- GND [pin 3]
- VCC [pin 5]
- Y [pin 4]

*The full schematic, PCB layout, bill of materials, and interactive design are available at [https://flux\.ai/summerexe/microcat\-torso\-controller\~7y](https://flux.ai/summerexe/microcat-torso-controller~7y).*

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*Generated from [https://flux\.ai/summerexe/microcat\-torso\-controller\~7y](https://flux.ai/summerexe/microcat-torso-controller~7y)*